Update dependency lxml to v4.6.5 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
lxml (source, changelog)	==4.6.2 -> ==4.6.5

GitHub Vulnerability Alerts

CVE-2021-28957

An XSS vulnerability was discovered in the python lxml clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.

CVE-2021-43818

Impact

The HTML Cleaner in lxml.html lets certain crafted script content pass through, as well as script content in SVG files embedded using data URIs.

Users that employ the HTML cleaner in a security relevant context should upgrade to lxml 4.6.5.

Patches

The issue has been resolved in lxml 4.6.5.

Workarounds

None.

References

The issues are tracked under the report IDs GHSL-2021-1037 and GHSL-2021-1038.

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Release Notes

lxml/lxml

v4.6.5

Compare Source

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Bugs fixed

• A vulnerability (GHSL-2021-1038) in the HTML cleaner allowed sneaking script
  content through SVG images (CVE-2021-43818).

• A vulnerability (GHSL-2021-1037) in the HTML cleaner allowed sneaking script
  content through CSS imports and other crafted constructs (CVE-2021-43818).

v4.6.4

Compare Source

==================

Features added

• GH#​317: A new property system_url was added to DTD entities.
  Patch by Thirdegree.

• GH#​314: The STATIC_* variables in setup.py can now be passed via env vars.
  Patch by Isaac Jurado.

v4.6.3

Compare Source

==================

Bugs fixed

• A vulnerability (CVE-2021-28957) was discovered in the HTML Cleaner by Kevin Chung,
  which allowed JavaScript to pass through. The cleaner now removes the HTML5
  formaction attribute.

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